Installation Cerabar M HART
14 Endress+Hauser
Vacuum application
For applications under vacuum, Endress+Hauser recommends mounting the pressure transmitter
below the diaphragm seal. This prevents a vacuum load of the diaphragm seal caused by the
presence of filling oil in the capillaries.
When the pressure transmitter is mounted above the diaphragm seal, the maximum height
difference H1 - as illustrated in the diagram below left - must not be exceeded. The maximum
height difference depends on the density of the filling oil and the lowest pressure that is permitted
to occur at the diaphragm seal (empty tank), see the following illustration.
Mounting with temperature isolator
P01-PMP4xxxx-11-xx-xx-xx-006
Endress+Hauser recommends the use of temperature isolators in the event of constant extreme fluid
temperatures which lead to the maximum permissible electronics temperature of +85°C (+185°F)
being exceeded. To minimize the influence of rising heat, Endress+Hauser recommends the device
be mounted horizontally or with the housing pointing downwards.
The additional installation height also brings about a zero point shift of approx. 21 mbar due to the
hydrostatic column in the temperature isolator. You can correct this zero point shift → see Page 29,
Section 6.2.5 "Position adjustment - only display (bias pressure)" (onsite operation) or via
communication → see Page 33, Section 6.3.7 "Position adjustment - only display (bias pressure)".
P01-PMP4xxxx-11-xx-xx-xx-001
Fig. 10: Installation above the diaphragm
seal
P01-PMx7xxxx-05-xx-xx-xx-011
Fig. 11: Diagram of maximum installation height above the
diaphragm seal for vacuum applications as a function of
the pressure at the diaphragm seal
H1
max. 115
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